/**
 * \file
 *
 * \brief STDIO redirection terminal
 *
 * Copyright (C) 2015 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */

#include <stdio.h>
#include <stdio_io.h>

/** IO descriptor for STDIO access. */
static struct io_descriptor *stdio_io = NULL;

void stdio_io_init(struct io_descriptor *io)
{
#if defined(__GNUC__)
	/* Specify that stdout and stdin should not be buffered. */
	setbuf(stdout, NULL);
	setbuf(stdin, NULL);
/* Note: Already the case in IAR's Normal DLIB default configuration
 * and AVR GCC library:
 * - printf() emits one character at a time.
 * - getchar() requests only 1 byte to exit.
 */
#endif
	stdio_io = io;
}

void stdio_io_set_io(struct io_descriptor *io)
{
	stdio_io = io;
}

int32_t stdio_io_read(uint8_t *buf, const int32_t len)
{
	if (stdio_io == NULL) {
		return 0;
	}
	return io_read(stdio_io, buf, len);
}

int32_t stdio_io_write(const uint8_t *buf, const int32_t len)
{
	if (stdio_io == NULL) {
		return 0;
	}
	return io_write(stdio_io, buf, len);
}
